Serge Koussevitsky commissioned this man to write his Symphony for Organ and Orchestra. He wrote an opera that opens with the arrival of Laurie Moss' graduation gown. Three ascending notes in the brass open a work by this man that debuted at tax time. He quoted folk songs like "Camptown Races" in a work that incorporates spoken-word readings of texts like the Gettysburg Address. He used themes from the Shaker hymn "Simple Gifts" for ballet choreographed by Martha Graham. Another of his ballets contains a "Hoe Down." He composed Fanfare for the 
Serge Koussevitsky commissioned this man to write his Symphony for Organ and Orchestra. He wrote an opera that opens with the arrival of Laurie Moss' graduation gown. Three ascending notes in the brass open a work by this man that debuted at tax time. He quoted folk songs like "Camptown Races" in a work that incorporates spoken-word readings of texts like the Gettysburg Address. He used themes from the Shaker hymn "Simple Gifts" for ballet choreographed by Martha Graham. Another of his ballets contains a "Hoe Down." He composed Fanfare for the Common Man and the ballets Rodeo and Billy the Kid. For 10 points, name this composer of Appalachian Spring.
Serge Koussevitsky commissioned this man to write his Symphony for Organ and Orchestra.
Aaron {Copland}